Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b769178c1fd0ef2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-10 15:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef76c730a35e0373e0e0563658d26f85 SHA-1: 269a80a585fc72c9877c1357740b476ad0ff2c97 SHA-256: 7b769178c1fd0ef2b70ece595b243d3e04005398367065a1b262116bf00085b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/aws?utm_term=stephen+king+it+chapter+2
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/0a2178a27aa34f3.pdf
    • http://gajaxujifusokul.mygamesonline.org/how_many_pages_are_in_the_road_by_cormac_mccarthy.pdf
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/eca6c91.pdf
    • http://bumufirila.mygamesonline.org/87366602237.pdf
    • http://mitipevebedo.iblogger.org/faneto.pdf
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/fovubisosuj_samanejutujux.pdf
    • https://cdn-cms.f-static.net/uploads/4495265/normal_60183805f34fc.pdf
    • http://lowevujum.iblogger.org/34655544402.pdf
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/9931389.pdf
    • http://fafesixokegigi.getenjoyment.net/38679812769.pdf
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5fdb24e43687d.pdf
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5fc71e9e5a988.pdf
    • https://timowerudep.weebly.com/uploads/1/3/0/7/130738780/eb56322a1e3.pdf
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/fdfbee26a88e529.pdf
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/1800210.pdf
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/469141.pdf
    • http://fivadoguna.medianewsonline.com/cross_sectional_anatomy_of_brain.pdf
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/pijuwi_pimowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gelunusa.epizy.com/77721842496.pdf
    • http://witopovuketoj.epizy.com/86171374235.pdf
    • http://javodorudorujiw.epizy.com/dark_knight_rises_batman_vs_joker.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35f.bin
4e686e7edf616383a1fa9bd58fb9a403c83b40bdbeb7967e26b2a2b2a0ca8554		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5284 bytes
font_01_sfnt_off0001055a.bin
43fde68e0dba0c29390e824c0c0c79a764e25decc726f17950ddf22d5c26abc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10740 bytes

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